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Power Systems

Power Systems
A loss less transmission line has a length of 600 km, find the phase shift of voltage signal?

 90°
 42°
 45°
 36°

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Power Systems
Ferranti effect will not occur in which of the following transmission lines

All of these
 short transmission lines
 long transmission lines
 medium transmission lines

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Power Systems
The sequence components of the fault current are as follows: IR1 = j1.5 pu, IR2 = -j0.5 pu, IR0 = -j1. The type of fault is

 LG
 LL
 LLL
 LLG

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Power Systems
In transmission lines distribution constants are

 inductance and capacitance
 inductance and resistance
 resistance
 both 1 and 2

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Power Systems
A guard ring is used in string type insulator having 3 units to improve string efficiency. Find the capacitance of metal link 2 if pin to earth capacitance of each unit is 1 F?

 0.5 F
 2 F
 4 F
 1 F

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Power Systems
A 1- phase transmission line operating at 30 kV has radius of 1 cm and distance between conductors is 0.5 m. Assume m = δ =1, g = 21 kV/cm and frequency f = 50 Hz. Find the critical disruptive voltage?

 34.64 kV/phase
 17.32 kV/phase
 41.075 kV/phase
 82.15 kV/phase

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